<!doctype html>
<html lang="zh-CN">

<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
  <title>register</title>

  <!-- Bootstrap -->
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"
    integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">

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      <script src="https://cdn.jsdelivr.cn/npm/html5shiv@3.7.3/dist/html5shiv.min.js"></script>
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    <![endif]-->
  <script src="https://cdn.bootcdn.net/ajax/libs/axios/1.3.4/axios.js"></script>
  <style type="text/css">
    body {
      padding-top: 40px;
      padding-bottom: 40px;
      background-color: #eee;
      background-image: url(../img/CSDN浏览器助手_壁纸_1678955109445.png);
      background-size: cover;
    }

    .container {
      max-width: 330px;
      padding: 15px;
      margin: 10% auto 0;
      background-color: rgba(255, 255, 255, .5);
      border-radius: 5px;
    }

    .container button {
      width: 300px;
      margin-bottom:20px;
    }

    .container h2 {
      margin-bottom: 20px;
    }
  </style>
</head>
<body>
  <div class="container">
    <h2>用户注册</h2>
    <div class="form-group">
      <input type="email" class="form-control" id="exampleInputUserName" aria-describedby="emailHelp" placeholder="账号">
    </div>
    <div class="form-group">
      <input type="password" class="form-control" id="exampleInputPassword" placeholder="密码">
    </div>
    <button type="submit" class="btn btn-primary">注册</button>
  </div>
  <!-- jQuery (Bootstrap 的所有 JavaScript 插件都依赖 jQuery，所以必须放在前边) -->
  <script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.js"
    integrity="sha384-nvAa0+6Qg9clwYCGGPpDQLVpLNn0fRaROjHqs13t4Ggj3Ez50XnGQqc/r8MhnRDZ"
    crossorigin="anonymous"></script>
  <!-- 加载 Bootstrap 的所有 JavaScript 插件。你也可以根据需要只加载单个插件。 -->
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.js"
    integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous">
    </script>
  <script>
    let btn = document.querySelector(".btn");
    let exampleInputUserName = document.querySelector("#exampleInputUserName");
    let exampleInputPassword = document.querySelector("#exampleInputPassword");
    btn.onclick = async function () {
      if (exampleInputUserName.value && exampleInputPassword.value) {
        let { data } = await axios({
          url: "http://localhost:3000/user",
          method: "get",
          params: {
            userName: exampleInputUserName.value
          }
        })
        if (data.length) {
          alert("账号已存在,请重新输入!")
        } else {
          let res = await axios({
            url: "http://localhost:3000/user",
            method: "post",
            data: {
              userName: exampleInputUserName.value,
              password: exampleInputPassword.value
            }
          })
          window.location.href = "login.html"
        }
      } else {
        alert("账号或密码不能为空!")
      }
    }
  </script>
</body>

</html>